A woman with E.Asian accent, claiming to be from an independent medical research body - she gave its name and her own, but I've forgotten both! - wanting to survey over-50s. She also had the surname of the person to whom she wanted to speak but did nothing to ensure that she was talking to that person.
She was polite and her survey might have even have been 'virtuous', but I didn't waste time finding out, because there are NO legitimate circumstances in which she would be calling our number. When asked where she got it, she responded with the stock phrases (used by good guys as well as the rogues) to avoid saying that they have absolutely no idea, they've just been given a list of numbers to call. This was AT BEST a cold call, in breach of all kinds of legislation and guidelines.